Now that spring is in the air, parents with young children will begin dusting off those baby joggers and bike trailers that have been stored away all winter. But while these items can help parents keep fit while bonding with their babies, they can also be the cause of pain and injury if not used properly, warns the American Chiropractic Association (ACA). They also recommend that when biking with a child on board, use a trailer, a rolling ride-along that hitches to the back end of a bike. It is a much safer option than a carrier, a "passenger" seat that sits directly on the bike. For those wishing to go for a jog and bring their child along for the ride, the baby jogger is the best option. A baby jogger is a rolling pushcart that a parent can jog behind, using handlebars to maneuver.